Well no one is sure naruto has rm but yea I agree sasuke would neg him if he didn't have it and I thought naruto fused the kurama avatars before getting natural energy I thought the natural energy he gathered was just for the BRS and RS cuz he was low on chakraIf you're talking about the Naruto that fought Toneri then Sasuke would blitz him with Amenotejikara and put a Chidori through his back.
If this is Hypothetical RM Naruto then it would be a stalemate like before.
People forget that Naruto can't use the Ashura Avatar instantly since he needs to gather massive amounts of Natural energy and since Sasuke already fought him he would know not to let Naruto absorb all that Natural energy.
Well no one is sure naruto has rm but yea I agree sasuke would neg him if he didn't have it and I thought naruto fused the kurama avatars before getting natural energy I thought the natural energy he gathered was just for the BRS and RS cuz he was low on chakra